Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. See news and announcements

GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

23619 results found.

  1. GRB 100606A: Swift detection of a burst
  2. Swift detection of outburst from the SFXT IGR J18410-0535
  3. GRB 100111A: Maidanak optical observations
  4. GRB 100418A: Maidanak optical observations
  5. Konus-Wind observation of GRB 100528A
  6. GRB 100528A: Faulkes Telescope North Detection
  7. GRB 100528A: GROND detection in all bands
  8. GRB 100528A: NOT optical observation
  9. Swift UVOT and UVOT-enhanced XRT position for GRB 100528A
  10. GRB100526B: GROND Upper limits
  11. GRB 100528A: SuperAGILE Localization of a Long GRB
  12. GRB 100526B: Swift-XRT confirmation of fading afterglow
  13. GRB 100526B: Swift-BAT refined analysis
  14. GRB 100526B: Swift XRT/UVOT observations
  15. GRB 100526A: Swift-BAT refined analysis
  16. GRB 100526B: Swift detection of a probable GRB
  17. GRB 100526A: MASTER-Net optical alert observations
  18. GRB 100526A: Swift detection of a burst
  19. Konus-Wind observation of GRB 100522A
  20. GRB100522A: Suzaku WAM observation of the prompt emission
  21. Swift/UVOT observations of GRB100522A.
  22. GRB 100522A, Swift-BAT refined analysis
  23. GRB 100522A: Enhanced Swift-XRT position
  24. GRB 100522A: NIR observations from CAHA
  25. GRB 100522A: BOOTES-2 optical limit
  26. GRB 100522A: Swift detection of a burst
  27. GRB 100518A: GROND afterglow observation and photo-z
  28. GRB 100518A: Swift/UVOT Upper Limits
  29. GRB 100518A: Swift-XRT refined analysis
  30. GRB 100518A: optical afterglow decay
  31. GRB 100518A: BOOTES-3 optical observations
  32. GRB 100518A: Faulkes Telescope North Afterglow Candidate
  33. GRB 100518A: Swift target of opportunity observation of the INTEGRAL burst
  34. GRB 100518A: a long GRB detected with INTEGRAL
  35. Swift Trigger 422437 is probably not a GRB
  36. GRB 100517A: MASTER-Net wide field camera prompt optical observations
  37. GRB 100514A: YNAO-GMG observations
  38. GRB 100514A: MASTER-Net optical observations
  39. GRB 100514A: Swift-BAT refined analysis
  40. GRB 100514A: Faulkes Telescope South observations
  41. GRB 100514A: Swift detection of a burst
  42. GRB 100513A: Faulkes Telescope South observations
  43. GRB 100513A: Swift-BAT refined analysis
  44. GRB 100513A: Gemini/GMOS Spectroscopic Redshift
  45. GRB 100513A: Swift detection of a burst
  46. GRB 100510A: Fermi GBM detection/observation
  47. GRB 100511A: Fermi GBM detection/observation
  48. GRB100504A: Optical upper limits at IAO
  49. GRB 100510A: MAXI/GSC detection
  50. Trigger 421695: Swift detection of a possible burst
  51. GRB100503A: Suzaku WAM observation of the prompt emission
  52. GRB 100508A: GROND Detection of the optical afterglow
  53. GRB 100508A: Swift-BAT refined analysis
  54. GRB 100508A: Swift detection of a burst
  55. GRB 100418A: Keck imaging
  56. GRB 100418A: RTT150 optical observations
  57. Swift-BAT refined analysis of trigger 421262
  58. An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
  59. GRB 100504A: Swift/UVOT Observations
  60. GRB 100504A: GROND Upper limits
  61. GRB 100504A: Swift-BAT refined analysis
  62. GRB 100504A: SARA-South Upper Limit
  63. GRB 100503A: Fermi GBM detection
  64. GRB 100504A: Swift detection of a burst
  65. Swift-BAT trigger 421072 is not astrophyical
  66. GRB100423A : Suzaku WAM observation of the prompt emission
  67. Trigger 421072: Possible Swift detection of a GRB or transient
  68. GRB 100423A: xinglong TNT optical upper limit
  69. GRB 100420A: Terskol optical upper limit
  70. GRB 100418A: RTT150 optical observations
  71. Konus-Wind observation of GRB 100423A
  72. GRB 100418A: Terskol optical observations
  73. GRB 100424A: NIR Afterglow Confirmation
  74. GRB 100424A: Gemini/NIRI H-band observations
  75. GRB 100425A: Swift-BAT refined analysis
  76. GRB 100425A: VLT/X-shooter redshift
  77. GRB 100425A: GROND afterglow observation
  78. GRB 100424A: Gemini/NIRI Candidate Afterglow
  79. GRB100424A: MITSuME optical upper limits
  80. GRB100423A: MITSuME optical upper limits
  81. GRB 100424A: GROND Upper Limits
  82. GRB 100424A: Swift-XRT refined analysis
  83. GRB 100425A: Swift detection of a burst
  84. GRB 100424A, Swift-BAT refined analysis
  85. GRB 100424A: Swift detection of a burst
  86. Swift-BAT refined analysis of trigger 420256
  87. GRB 100418A: Possible Evidence for a Supernova
  88. GRB 100420A: Swift-BAT refined analysis
  89. GRB 100423A: Swift-BAT refined analysis
  90. Swift Trigger 420256: BOOTES-2 observations
  91. Trigger 420256: Swift detection of a possible GRB
  92. GRB 100423A: Skynet/PROMPT Detections
  93. GRB 100423A: GROND discovery of afterglow
  94. GRB 100423A: Swift detection of a burst
  95. GRB 100418A: Continuing Swift/UVOT Observations
  96. GRB 100418A: further GROND observations and light curve fit
  97. GRB 100418A: RTT150 optical observations
  98. GRB100420A: MITSuME optical upper limits
  99. GRB 100420A: Swift/UVOT Upper Limits
  100. GRB 100418A: RTT150 observations during the optical afterglow maximum

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov